This can happen due to a few factors like:

• the number of followers you have
• your content strategy
• your content does not provide value to your audience
• your posting style & overall theme
• growth strategies previously used on your account
• Instagram’s algorithm changes

In order to improve your engagement, focus on creating content that has typically brought you the most engagement in the past. Consistency is the biggest factor in improving engagement. You will need to be consistently creating valuable content to improve your engagement on Instagram. If you feel like your target audience on Instagram isn’t up-to-date, then updating your growth strategy in the Control tab will also help improve your engagement. This will help bring more engaging followers to your account.